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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<link rel="stylesheet" type="text/css" href="mystyle.css">
<style>
    h1 {
        color: orange;
    }
</style>

<h1>这是一个标题</h1>
<p>本文档的样式是外部样式表和内部样式的组合。</p>